Pneumatic door-check.



Patgnted nu fzl', I900. E. H. HARRISON & T/LAWSON.

PNEUMATIC DOOR CHECK.

(Application filed July 7, 1899.)

2 Sheets-Sheet l.

INVENTORS' ORNEYS.

1b,. M85911, BY M6 ar'lrm (No Model) WITNESSES:

No. 656,543. Patented Au 2!, I900.

' E. H. HARBISUN & T. LAWSON.

PNEUMATIC noun GHEGK.

(Application filed Jul 7, 1699.

{No Mudql.)

WITNESSES' INYENTOR5=- 1 i'fl /d, I (E Fr k inimn iilniren nni trllrrioni ENOR ll. liJiRRISON AND THOMAS LAW'SON, F NEWl'l-iRK, NElVJERSEY.

melanin/ eno noon oi- SPECIFICATKON forming part of Letters; Peienlcleteci .iliugnst 21, 1300.

Applioeiinn filed July 7, 1899 Sorini Ho. 753E110. (No model.)

5 a rear end. view of the pneumatic cylint lie it known ii-lint we, Enosll. HARRISON and THIUMz'sS ilnm'son, citizens of l-llQUllillGCl Sialos,residing at Newark, in the count-y of Essex and Sta-be of New Jersey,have invented cert-min new and useful improvements in ilnei mitioDom-Cheeks; anti We do hereby lilo followin lo lie a lull, clear, andoxaiomiosoriyuion of the invention, such as will enable others skilledin time art; to which it ap- PGl JZilIlra' to lllilliO end use the some,reference being had to the accompanying drawings, and to letters 01reference marked thereon, which form oi purl, of this specification.

The objects of this invention are to pro rifle oi pneumatic riuor-oheokwhich will be applicable to a, double-acting door or a door onprilile ofopening inwardly and onlwairally on its hinges, to provide ii cheekwhich will be less visible to the rye and one thetwill not an;oifoobnnlly and efficiently in checking ililfllDWfl-lil movement of thodoor as in Gllfifili" in its outward movement, to reduce illlE': cool;of cone naction and provide ii iii mole and coin pawn nrrengenieni whichwill be durable and strong and less liable to get out; of order, and tosecure other advantages and results, some oi? which may be roi'errei tohereinafter in oonneelion. wiin the description 'of the worklog ports.

The invention consists in the improvedpneumzicio ioor-olleolii nnil in;l-lie ill'l'illlgfi" moons and combinations of pin-to of the some, allsnbsmniiel-ly will be heroine-lilo]! eei; forth, and finally omlirnoeilin the clauses oi the claim.

. liielerring to the accompanying drawings, in which like letters ofreference iili oorreepomiing parts in OzuSll oi. the several ligores-Fignre l is a front elevation of lhe upper pawl; of :1.- door and iizgeframe to which our inn proved door-chock has been applied, the sin-iddoor mn'l' its frame being;- in pnrtiol section to Show the operatingpin-ls more clearly. lllff. 2 in a, sectional View oi the doorll'llill'd and olieelc, taken. at line :11, Fig. i. Fig. is a Win of the(loo-Pollock detached from the ons i 0, and showing the pin-ls, on ononlnrgeil e :aile with o, (5(llll'l60illlg-2ll'lll of ;i type adopt e li'or is, single-noting (loor. 'l ig, l in n oes- Zion olllie some, takenno lixioiy, Fig. 31 Fig".

enowing 11 means for adjusting the nir'eeenpe v re. iii Elie n sectionaldetail ion in; lin is a side eleveiion in (lei/nil, elion'inooneirnolerl 1' ill rloni'i melin door. in :3; rl rim-swings, o indzitoe 2i bBll-plllfi,

Wllifill donglindinolly slotted, or at u-'-, to r oeiv n, oonneoling-nrmI) and perm it the movelnont oi the slime longitudinally when operatednoon by line pielonrmi (1. Ti 9 said slot a is located at one end of thebed-plate and extomle to a point about at tile miridle of the midiboil-pinto, the other end of the said bed.- plarle being uneloilod endon the upper or ine; the connecting-min "vi-mil. side furnishing o seator support fore pnenmniie cylinder 0, soldered to said plate orotherwise suitably eeonreil thereto. Also on liie upper aide of illlOezziri pinto re around the slot n, is formed on upwardly-projeetingflange a", tile llliililf} face of which ooincidos' with line inni-r'ieWells of the slot, Boid ineirlo wells of the Silltl. flange (1 serve asbeam ings for it roller (1, attach-oil to the arm 11,

Trill be hereinafter more fully described, and also form a l; the upperedne El. slidewny for o. sliding plate j, which lies in. line orapproximately in. line with the longitudinal axis of the pneumaticcylinder 1;. 'llieenid eiiiling pinto f is threaded at its anal toward,mill (1' lilo :illt-llflihlfiil (Z, which extends. inwardly in o {Mildcylinder where lilo Enid rod is pro- Viciorl n L n lis'l -onl1en(l g, ofleather, backed by e we oone zrneiion adopted ho secure a. properimpervious ill; in the cylinder. The said sliding plate j in providedwith or receives the upper end of n slurilj", which extends llOWl1-n'zirdiy through the slot o and upon which is arranged the roller 0above referred to, and at tile lower end of swirl stud fastened theeonneoliggqirm b, which extends to ziyplote h adapted to liefmsionocl'to the top of the door ii it will unnerslood that, theboil-plate no is lei; into the top of lhe floor-casing m and fastened byscrews 11 in Snell position that its 1' or liililfil face is flush withthe-surface oeeing'. Enid pinto is disposed directly nlloro-l-lie cioorwhen normal position orin the some vertical plane, and the casing m isll washer or of any other suitable deeply recessed to receive the partscarried 1 by said bed-plate.

The parts of the check are so arranged and disposed that when the dooris opened in one direction or in the other the piston is drawn out ofits cylinder and an inflow of air isioc casioned through the valve 1 atthe end of the said cylinder. Upon releasing the door a suitable spring,arranged at the hinges 1 of to the door or upon the piston, as shown inFigs.

3 and 4 and marked it, servesto close said door automatically againstthe body. of air contained within the cylinder. Said cylinder isprovided at its rear end with a leak-hole 0,

:5 adapted to permit a slow outflow of the-confined air, so that thedoor impelled by the spring gradually and slowly closes as permitted bythe air slowly outfiowing through said leak-hole. jlhe speed of theoutflow is and 22 may be regulated and controlled by a screw p, whichenters the outflow-opening and tends to close the same, the screw beingheld in said outflow-opening by a spring q and nut'q, the

so that the latter holds the screw into the out-v passage openingo withgreater or less firmness, thus regulating the degree of pressurerequired to open the outflow-valve.

To permit a free infiow'of air to the interior of the cylinder when thepiston is drawn outwardly, an inwardly-opening check-valve r is providedat the end of the cylinder. This 40 valve may be of any suitableconstruction to be unseated by the inflowing air and firmly seated byoutflowing air to prevent any as cape of. the compressed air, exceptthrough the leak-valve 0..

5 To secure compactness and reduce the strain on the door, we prefer toemploya doorclosing spring :70 in connection with the pneumaticpiston-rod d, the spring being arranged between the head of the pistonand a bearing s, fastened to the bed-plate 0. outside of the saidpiston. The said spring is coiled around the piston-rod d and tends toclose the door against the outflowing air, as above indicated. Obviouslythissprin g could be dispensed with and springs employed at the hingesin any usual manner;

Itwill beseen from the foregoing description-ef our construction thatthe bedplate a, yrith al'l'the parts it supports when appiied'to a door,lies out of sight in the recesst in the door-frame or casing, with thelower surface .of'said'bedmlate flush with the surface of thedoor-frame. The said recessis' on t. directly top of the door, asdoesalso the plate h, and

thus all the parts are unnoticeable and a very pleasing appearance issecured. When the door is opened, the connecting-arm is the only partbroughtinto prominent view.

Where our improved device is applied to a door opening in only onedirection, we prefer to use a connecting-arm b and-plate h, as 7 5 shownin Fig. 3; but in connection with a double-acting door it becomesnecessary to use the slightly-modified form shown more particularly inFigs. 2 and 7, so as to permit a free swing to either side. Furthermore,while we have shown the cylinder 0 and cooperating parts circular incross-section it will be evident that to enable the same to be fittedinto anarrower recess or space, such as would be provided by a thinnerdoor, the said cylinder may be oval and inserted edgewise. Other slightchanges and modifications may be made without departing from the spiritand scope of the invention.

Having thus described the invent-ion, what 99 we claim as new is- 1. Ina door-check, the combination of a plate adapted to be sunk into arecess in the top of the door-frame directly above the door when inclosed position, said plate'being Ion-= gitudinally slotted at one endand having at the opposite longitudinal sides of said slotupwardly-projecting ribs, said ribs forming at their edges slideways fora piston-slide and at their inner faces formingbearingsurfaces roe for aroller, avalved cylinder secured longitudinally upon the upper surfaceof the plate at the end opposite the said slot and adapted to lie in therecess in the door-frame, a piston working in said cylinder and havingits outer to 5 end adjustably connected to a slide arranged on saidslideways, a pin pivotally arranged in said slide and extending downwardthrough. the slot, a roller arranged on said pin in said slot, and anarm adapted to lie beneath the 1&0

slotted portion of the plate when the door is closed and having its endnext the cylinder pivoted on said pin and its opposite end pivoted tothe door, substantially as set forth.

2. In a doorcheck,'the combination of a n5 plate slotted near one endand havinga valved cylinder on the nnslotted end arranged inline, withthe slot,'a piston working in said cylinder, a slide at the outer end ofsaid piston and reciprocating. at the upper side of the-slotted 12oplate longitudinally slotted and flanged on the inner side fora portionor its-length and also having at its'inner sidea valved cylinder :36

longitudinally-disposed at the unslotted end of said plate, a pistonworking at one endinsaid-cylinder and at the opposite end connected to aslide, said slide arranged on the 656,843 inner efiges of the flanges, aroller arranged We have hereunto set our hands this; 20th daybetweeneaid flanges, an arm serving to 0011- of June, 1899.

neet the slide with the door and a pivotal pin ENOS H. HARRISON.

connecting the arm, slide and roller and hold- V THOMAS LAWSON. 5 ingthe same in opei'ative position, substan- Witnesses: tially as setforth. i CHARLES H. FELL;

In testimony that we claim the foregoing (L B. PITNEY.

